[issue2504] Add gettext.pgettext() and variants support

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

It was an answer to «Is there anything I can do to help get this into the codebase»

Feel free to take this on!  I’ll try to review.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue2504>
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